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/* External Imports */
import { Contract, ethers } from 'ethers'
import {
TransactionResponse,
TransactionRequest,
} from '@ethersproject/abstract-provider'
import { keccak256 } from 'ethers/lib/utils'
import {
AppendSequencerBatchParams,
BatchContext,
encodeAppendSequencerBatch,
remove0x,
} from '@eth-optimism/core-utils'
export { encodeAppendSequencerBatch, BatchContext, AppendSequencerBatchParams }
/*
* OVM_CanonicalTransactionChainContract is a wrapper around a normal Ethers contract
* where the `appendSequencerBatch(...)` function uses a specialized encoding for improved efficiency.
*/
export class CanonicalTransactionChainContract extends Contract {
public customPopulateTransaction = {
appendSequencerBatch: async (
batch: AppendSequencerBatchParams
): Promise<ethers.PopulatedTransaction> => {
const nonce = await this.signer.getTransactionCount()
const to = this.address
const data = getEncodedCalldata(batch)
const gasLimit = await this.signer.provider.estimateGas({
to,
from: await this.signer.getAddress(),
data,
})
return {
nonce,
to,
data,
gasLimit,
}
},
}
public async appendSequencerBatch(
batch: AppendSequencerBatchParams,
options?: TransactionRequest
): Promise<TransactionResponse> {
return appendSequencerBatch(this, batch, options)
}
}
/**********************
* Internal Functions *
*********************/
const APPEND_SEQUENCER_BATCH_METHOD_ID = keccak256(
Buffer.from('appendSequencerBatch()')
).slice(2, 10)
const appendSequencerBatch = async (
OVM_CanonicalTransactionChain: Contract,
batch: AppendSequencerBatchParams,
options?: TransactionRequest
): Promise<TransactionResponse> => {
return OVM_CanonicalTransactionChain.signer.sendTransaction({
to: OVM_CanonicalTransactionChain.address,
data: getEncodedCalldata(batch),
...options,
})
}
const getEncodedCalldata = (batch: AppendSequencerBatchParams): string => {
const methodId = APPEND_SEQUENCER_BATCH_METHOD_ID
const calldata = encodeAppendSequencerBatch(batch)
return '0x' + remove0x(methodId) + remove0x(calldata)
}